How to change byte to HexString

private final static String[] bts= {
		"00","01","02","03","04","05","06","07","08","09","0A","0B","0C","0D","0E","0F",
		"10","11","12","13","14","15","16","17","18","19","1A","1B","1C","1D","1E","1F",
		"20","21","22","23","24","25","26","27","28","29","2A","2B","2C","2D","2E","2F",
		"30","31","32","33","34","35","36","37","38","39","3A","3B","3C","3D","3E","3F",
		"40","41","42","43","44","45","46","47","48","49","4A","4B","4C","4D","4E","4F",
		"50","51","52","53","54","55","56","57","58","59","5A","5B","5C","5D","5E","5F",
		"60","61","62","63","64","65","66","67","68","69","6A","6B","6C","6D","6E","6F",
		"70","71","72","73","74","75","76","77","78","79","7A","7B","7C","7D","7E","7F",
		"80","81","82","83","84","85","86","87","88","89","8A","8B","8C","8D","8E","8F",
		"90","91","92","93","94","95","96","97","98","99","9A","9B","9C","9D","9E","9F",
		"A0","A1","A2","A3","A4","A5","A6","A7","A8","A9","AA","AB","AC","AD","AE","AF",
		"B0","B1","B2","B3","B4","B5","B6","B7","B8","B9","BA","BB","BC","BD","BE","BF",
		"C0","C1","C2","C3","C4","C5","C6","C7","C8","C9","CA","CB","CC","CD","CE","CF",
		"D0","D1","D2","D3","D4","D5","D6","D7","D8","D9","DA","DB","DC","DD","DE","DF",
		"E0","E1","E2","E3","E4","E5","E6","E7","E8","E9","EA","EB","EC","ED","EE","EF",
		"F0","F1","F2","F3","F4","F5","F6","F7","F8","F9","FA","FB","FC","FD","FE","FF"
	};

	public String byteToHex(byte b){
		return bts[b&0xff];
	}